A 3rd-party MAXScript known as "ADSL" can accidentally corrupt 3ds Max software settings.
This malicious code can be propagated to other scene files (*.max) on a system if scene files containing it are loaded into 3ds Max. The 3ds Max Security Tools can detect and clean it from the user’s startup scripts and infected scene files. For more information about this malicious script, see the following support article: Support article on CRP and ADSL MAXScripts .